Want to learn some Hadoop, eh? Well, get ready to drink from the fire hose, because the Hadoop ecosystem is crammed full of software, much of which duplicates efforts, and much of which is named so similarly that it’s very confusing for newcomers. Learn more about the core pieces of Hadoop functionality.

SQL, NoSQL, KnowSQL are all overloaded terms. Postgres has long taken a liberal approach to datatypes and schema-less datatypes play very well in its world. Here’s a broader article that hints at much of this if you need a case vs. relational/NoSQL because with Postgres you really can have your cake and eat it too.